android编程实现系统图片剪裁的方法

package cn.test;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import android.app.Activity;import android.content.ContentResolver;import android.content.ContentUris;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class CutActivity extends Activity { private Button button; private ImageView imageView; private File mCurrentPhotoFile; private Bitmap cameraBitmap; @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.main);  button = (Button) findViewById(R.id.button);  imageView = (ImageView) findViewById(R.id.imageView);  button.setOnClickListener(new OnClickListener() {   @Override   public void onClick(View v) {    Intent intent = new Intent(    "android.media.action.IMAGE_CAPTURE");    mCurrentPhotoFile = new File(      "mnt/sdcard/DCIM/Camera/",      getPhotoFileName());   intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mCurrentPhotoFile));  startActivityForResult(    intent,    Activity.DEFAULT_KEYS_DIALER);   }  }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  switch (requestCode) {  case 1:   Uri imgUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;   ContentResolver cr = CutActivity.this     .getContentResolver();   Uri fileUri = Uri.fromFile(mCurrentPhotoFile);   sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,     fileUri));   try {    Thread.sleep(3000);   } catch (InterruptedException e) {    e.printStackTrace();   }   Cursor cursor = cr     .query(imgUri, null,       MediaStore.Images.Media.DISPLAY_NAME + "='"         + mCurrentPhotoFile.getName() + "'",       null, null);   Uri uri = null;   if (cursor != null && cursor.getCount() > 0) {    cursor.moveToLast();    long id = cursor.getLong(0);    uri = ContentUris.withAppendedId(imgUri, id);   }   final Intent intent = new Intent(     "com.android.camera.action.CROP");   intent.setDataAndType(uri, "image/*");   intent.putExtra("crop", "true");   intent.putExtra("outputX", 380);   intent.putExtra("outputY", 500);   intent.putExtra("return-data", true);   CutActivity.this.startActivityForResult(intent, 3);   break;  case 2:   break;  case 3:   if (data != null) {    cameraBitmap = (Bitmap) data.getExtras().get("data");    imageView.setImageBitmap(cameraBitmap);   }   break;  default:   break;  }  super.onActivityResult(requestCode, resultCode, data); } private String getPhotoFileName() {  Date date = new Date(System.currentTimeMillis());  SimpleDateFormat dateFormat = new SimpleDateFormat(    "'IMG'_yyyyMMdd_HHmmss");  return dateFormat.format(date) + ".jpg"; }}